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Sr n +1 Ti n O 3 n +1 (n=1, 2) microwave dielectric ceramics with medium dielectric constant and ultra‐low dielectric loss
Author(s) -
Liu Bing,
Li Lei,
Liu Xiao Qiang,
Chen Xiang Ming
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14591
Subject(s) - dielectric , ceramic , materials science , microstructure , tetragonal crystal system , scanning electron microscope , analytical chemistry (journal) , permittivity , microwave , grain size , mineralogy , crystallography , crystal structure , composite material , chemistry , physics , optoelectronics , chromatography , quantum mechanics
Sr n +1 Ti n O 3 n +1 (n=1, 2) ceramics with tetragonal Ruddlesden–Popper structure were prepared via a standard solid‐state reaction process, and their microstructures and microwave dielectric properties were investigated systematically. The phase composition, grain morphology, and densification behavior were explored using X‐ray diffraction ( XRD ) and scanning electron microscopy ( SEM ). Outstanding microwave dielectric properties were achieved in the present ceramics: ε r =42, Q × f =145 200 GH z, τ f =130 ppm/°C for Sr 2 TiO 4 , and ε r =63, Q × f =84 000 GH z, τ f =293 ppm/°C for Sr 3 Ti 2 O 7 , respectively. The present ceramics might be expected as excellent candidates for next‐generation medium‐permittivity microwave dielectric ceramics after the further optimization of τ f value.